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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cc855f5b010bfc5ade01a777ae47e1bae5aeb97a9f77dca44f43cca9028355' 
  AND token = '6TE8cqHDw3ueuS4HiPIJ9KOBJpLd/PfTmqwFaa8OTYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}